Sash-lock.



N0. 761,266. PATENTED JUNE 16, 1906. A. E. AYER.

SASH LOOK.

APPLICATION mum JULY 1.1, 1902.

\X/wNEss ES UNITED STATES] Patented June 16, 1903.

PATENT OFFIQE.

ALBERT E. AYER, OF EAST BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO THOMAS F. LANE, OF EAST BOSTON, MASSACHUSETTS.

LOCK.

SPECIFICATION forming part of Letters Patent N 0. 731,266, dated June 16, 1903.

Application filed July I], 1902. Serial No. 115,149. (No model.)

To all whom, it may concern:

Be it known that I, ALBERT E. AYER, of East Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Sash-Locks, of which the following is a specification.

This invention relates to sash-locks of that type designed to secure the two sashes of a,

window in relative positions either when closed tightly or when partially open.

The object of the invention is toprovide a simple, cheap, and easily-operated device of the character described, the latching member of the device being adapted to be secured to the upper or horizontal surface of a lower window-sash, where it will be practically out of the way and almost out of sight and yet may be readily reached for operation.

To these ends the invention consists in the construction and combination of the parts substantially as hereinafter described and claimed.

In the drawings, Figure l represents in perspectivea portion of a window-casing and portions of the upper and lower sashes with my improved sash-lock in place and securing the sashes together when one of them is partly open. Fig. 2 is a similar View with the parts in the position which they occupy when the sashes are closed but unlocked, so that either sash may be opened. Fig. 3 represents a section on the line 3 3 of Fig. 1, showing a different form of dog. Fig. 4: represents a section on the line 4 4 of Fig. 2, showing the form of dog represented in- Fig. 3. Fig. 5 represents a detail showing thelatchin'g member in elevation, as when viewed from the bottom of Fig. 4. Fig. 6 represents a perspective View of the dog detached.

The same letters of reference indicate the same parts in all the figures.

The lower and upper sashes, which are or may be of any suitable type, are represented at a and b, respectively. To the side rail of the upper sash b is secured a rack c.

The latching member of the device comprises a base-plate cl, adapted to be secured to the horizontal upper surface of the lower sash a by screws (1. The outer edge of the base-plate (Z is formed with two sockets 61 The center of the base-plate is bored to receive a screw, bolt, or rivet f, upon which is pivoted the hub g of the swinging arm h, which is adapted to enter the space between any two teeth of the rack. Projecting laterally from the hub g are two lugs 2' i, each of which is formed with a vertical notch or recess 2", which opens downwardly A dog is is provided with trunnions k, projecting laterally from each side thereof and adapted to enter the notches or recesses e" and to form pivots for said dog. Obviously the two trunnions may be formed by setting a single pin through the dog k; but I prefer to form said trunnions is integral with the dog. Said dog, as shown in Figs. 1. and 2, is provided with aweight or knob 10 at its outer end and its lower portion is adapted to fit either one of the sockets d in the'base-plate. In Figs. 3, 4, 5, and 6 I show the dog with out the knob 70 and the sockets d formed as slots entirely surrounded by the material of the plate d.

The above-described construction of the latching member of the device is one that is Very cheap to produce, inasmuch as the three principal partsnamely, the base-plate cl, the arm and its hub, and the dog lc1nay each be cast. The parts of the latching member may 'be assembled by inserting the trunnions 7.6 in the notches or recesses 1," before the rivet or bolt f is applied to connect the hub g to the base-plate.

The operation of the device will be quite apparent from the drawings; but I will state briefly that when the parts are in the position shown in Fig. 2 a slight lift of the dog 7.; and then a pressure toward the left will first disengage the dog from the right-hand socket d and then swing the hub andits arm around so that the said arm will enter the space below the lower tooth of the rack, thereby locking the two sashes closed. By first raising the lower sash to any desired degree or lowering the upper sash before swinging the arm around from the position shown in Fig. 2 and upon then swinging the arm in the direction as above described the arm hwill enter the space between two teeth of the rack, as indicated in Fig. 1, and thus prevent either sash from being opened any wider or from being closed. 'When the arm and its hub are swung to the position shown in Figs. 1 and 3, the dog drops into the left-hand socket d and prevents the arm h from being disengaged from the rack in any other way than by first lifting the dog.

As indicated in Figs. 1, 2, and 5, the arm h presents a vertical front wall which is adapted to bear against or nearly against the baseplate of the rack when the parts are in the position shown in Fig. 3 and that from said front wall the upper and lower surfaces of said arm h are inclined or beveled rearwardly, so that said arm presents athin rear edge. This formation of said arm prevents any contact of any portion thereof with the horizontal sides of the rack-teeth excepting the portions of the arm which are close to the base of the rack-teeth therefore preventing any possibility of the arm being worked out from between said rack-teeth in case the toe or tooth of the finger-piece or lever has failed to engage the locking-notch (Z Moreover, the formation of the arm h as described insures that when it is in the position shown in Fig. 3 it can take a bearing against a side of a tooth of the rack only at the base thereof, thereby rendering it unnecessary to make the rack of excessive strength. If the arm were so shaped that its side might bear against a tooth near the apex of the latter, the leverage thus obtained might break the tooth in case of strain being brought against it unless the rack-teeth were made very heavy and strong.

I claim- A sash-lock comprising a rack adapted to be secured to an upper sash and a latching member consisting of a base-plate d having notches (P, the hub g pivotally connected with said base-plate and having an arm h adapted to engage said rack, said hub being provided with a dog adapted to engage either one of the notches of the base-plate, said arm being formed with a wide front edge to pass between the teeth of the rack and having its upper and lower sides beveled or inclined rearwardly from said edge, substantially as and for the purpose described.

In testimony whereof I have affixed my signature in presence of two witnesses.

ALBERT E. AYER. Vitnesses:

R. M. PIERSON, R. E. BULLocK. 

